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Derivative Financial Instruments Fair Value of Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset $ 14,476         $ 28,690
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 65,053         74,881
1:3 basis swaps [Member]            
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset 637         724
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 0         410
notional amount of terminated derivatives   $ 300,000 $ 700,000 $ 2,800,000 $ 2,700,000  
Proceeds to terminate and or amend derivative instruments   500 $ 3,700 $ 17,500 $ 34,400  
Interest rate swaps - floor income hedges [Member]            
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset 11,149         21,408
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 11,148         1,175
notional amount of terminated derivatives 500,000 3,100,000        
Proceeds to terminate and or amend derivative instruments 700 $ 3,000        
Swaption [Member]            
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset 716         3,257
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 0         0
Interest rate swaps - hybrid debt hedges [Member]            
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset 0         0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 11,646         7,646
Interest Rate Cap [Member]            
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset 287         1,570
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 0         0
Cross-currency interest rate swaps [Member]            
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset 0         0
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value 39,456         65,650
Other Contract [Member]            
Derivatives, Fair Value [Line Items]            
Fair value of derivative instruments, asset 1,687         1,731
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value $ 2,803         $ 0